The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform

Simo Syrjala - One of the best experts on this subject based on the ideXlab platform.

  • characterizing a uv chamber with Mercury Lamps for assessment of comparability to natural uv conditions
    Polymer Testing, 2009
    Co-Authors: Anu Heikkila, M. Kaunismaa, T. Ture, Petri Kärhä, Jussi Kaurola, Antti Tanskanen, Tapani Koskela, Simo Syrjala
    Abstract:

    Abstract UV radiation conditions in a UV chamber equipped with four 300-W Mercury vapour Lamps have been characterized to assess the exposure received by the specimens aged in the chamber. Spectrally resolved measurements were performed on UV radiation emitted by new Lamps and Lamps operated for 4850 h in the chamber. An intensity decrease of as much as 75% with a strong wavelength dependency was detected. By linking the measurements with independent broadband measurements of the UV radiation field emitted by a single lamp, the UV dose rate distribution on the specimen plane of the chamber was derived. A method for true exposure accumulation estimation, accounting for the fading of the Lamps, was developed. Accumulated UV radiation exposures on material samples in the chamber were derived and compared to long-term (1995–2007) average UV exposures received in natural sunshine at Jokioinen, Finland (lat. 60.4°N, long. 23.5°E, 104 m a.s.l.). Acceleration factors for the exposure in the UV chamber were derived in terms of doses integrated over different wavelength ranges. The acceleration factor was found to depend strongly on the wavelength range of the dose considered, presenting an extra challenge to the assessment of the artificial material exposure duration.

  • Characterizing a UV chamber with Mercury Lamps for assessment of comparability to natural UV conditions
    Polymer Testing, 2009
    Co-Authors: Annika Heikkilä, M. Kaunismaa, T. Ture, Petri Kärhä, Jussi Kaurola, Antti Tanskanen, Timo Koskela, Simo Syrjala
    Abstract:

    UV radiation conditions in a UV chamber equipped with four 300-W Mercury vapour Lamps have been characterized to assess the exposure received by the specimens aged in the chamber. Spectrally resolved measurements were performed on UV radiation emitted by new Lamps and Lamps operated for 4850 h in the chamber. An intensity decrease of as much as 75% with a strong wavelength dependency was detected. By linking the measurements with independent broadband measurements of the UV radiation field emitted by a single lamp, the UV dose rate distribution on the specimen plane of the chamber was derived. A method for true exposure accumulation estimation, accounting for the fading of the Lamps, was developed. Accumulated UV radiation exposures on material samples in the chamber were derived and compared to long-term (1995-2007) average UV exposures received in natural sunshine at Jokioinen, Finland (lat. 60.4°N, long. 23.5°E, 104 m a.s.l.). Acceleration factors for the exposure in the UV chamber were derived in terms of doses integrated over different wavelength ranges. The acceleration factor was found to depend strongly on the wavelength range of the dose considered, presenting an extra challenge to the assessment of the artificial material exposure duration. © 2008 Elsevier Ltd. All rights reserved.

David Pile - One of the best experts on this subject based on the ideXlab platform.

  • Ultraviolet goes solid-state
    Nature Photonics, 2011
    Co-Authors: David Pile
    Abstract:

    Semiconductor light-emitting diodes may soon replace Mercury Lamps as the ultraviolet source of choice in a wide range of applications. Researchers around the world are now racing to increase the efficiency and output power of such ultraviolet solid-state devices.

M. Kaunismaa - One of the best experts on this subject based on the ideXlab platform.

  • characterizing a uv chamber with Mercury Lamps for assessment of comparability to natural uv conditions
    Polymer Testing, 2009
    Co-Authors: Anu Heikkila, M. Kaunismaa, T. Ture, Petri Kärhä, Jussi Kaurola, Antti Tanskanen, Tapani Koskela, Simo Syrjala
    Abstract:

    Abstract UV radiation conditions in a UV chamber equipped with four 300-W Mercury vapour Lamps have been characterized to assess the exposure received by the specimens aged in the chamber. Spectrally resolved measurements were performed on UV radiation emitted by new Lamps and Lamps operated for 4850 h in the chamber. An intensity decrease of as much as 75% with a strong wavelength dependency was detected. By linking the measurements with independent broadband measurements of the UV radiation field emitted by a single lamp, the UV dose rate distribution on the specimen plane of the chamber was derived. A method for true exposure accumulation estimation, accounting for the fading of the Lamps, was developed. Accumulated UV radiation exposures on material samples in the chamber were derived and compared to long-term (1995–2007) average UV exposures received in natural sunshine at Jokioinen, Finland (lat. 60.4°N, long. 23.5°E, 104 m a.s.l.). Acceleration factors for the exposure in the UV chamber were derived in terms of doses integrated over different wavelength ranges. The acceleration factor was found to depend strongly on the wavelength range of the dose considered, presenting an extra challenge to the assessment of the artificial material exposure duration.

  • Characterizing a UV chamber with Mercury Lamps for assessment of comparability to natural UV conditions
    Polymer Testing, 2009
    Co-Authors: Annika Heikkilä, M. Kaunismaa, T. Ture, Petri Kärhä, Jussi Kaurola, Antti Tanskanen, Timo Koskela, Simo Syrjala
    Abstract:

    UV radiation conditions in a UV chamber equipped with four 300-W Mercury vapour Lamps have been characterized to assess the exposure received by the specimens aged in the chamber. Spectrally resolved measurements were performed on UV radiation emitted by new Lamps and Lamps operated for 4850 h in the chamber. An intensity decrease of as much as 75% with a strong wavelength dependency was detected. By linking the measurements with independent broadband measurements of the UV radiation field emitted by a single lamp, the UV dose rate distribution on the specimen plane of the chamber was derived. A method for true exposure accumulation estimation, accounting for the fading of the Lamps, was developed. Accumulated UV radiation exposures on material samples in the chamber were derived and compared to long-term (1995-2007) average UV exposures received in natural sunshine at Jokioinen, Finland (lat. 60.4°N, long. 23.5°E, 104 m a.s.l.). Acceleration factors for the exposure in the UV chamber were derived in terms of doses integrated over different wavelength ranges. The acceleration factor was found to depend strongly on the wavelength range of the dose considered, presenting an extra challenge to the assessment of the artificial material exposure duration. © 2008 Elsevier Ltd. All rights reserved.

Antti Tanskanen - One of the best experts on this subject based on the ideXlab platform.

  • characterizing a uv chamber with Mercury Lamps for assessment of comparability to natural uv conditions
    Polymer Testing, 2009
    Co-Authors: Anu Heikkila, M. Kaunismaa, T. Ture, Petri Kärhä, Jussi Kaurola, Antti Tanskanen, Tapani Koskela, Simo Syrjala
    Abstract:

    Abstract UV radiation conditions in a UV chamber equipped with four 300-W Mercury vapour Lamps have been characterized to assess the exposure received by the specimens aged in the chamber. Spectrally resolved measurements were performed on UV radiation emitted by new Lamps and Lamps operated for 4850 h in the chamber. An intensity decrease of as much as 75% with a strong wavelength dependency was detected. By linking the measurements with independent broadband measurements of the UV radiation field emitted by a single lamp, the UV dose rate distribution on the specimen plane of the chamber was derived. A method for true exposure accumulation estimation, accounting for the fading of the Lamps, was developed. Accumulated UV radiation exposures on material samples in the chamber were derived and compared to long-term (1995–2007) average UV exposures received in natural sunshine at Jokioinen, Finland (lat. 60.4°N, long. 23.5°E, 104 m a.s.l.). Acceleration factors for the exposure in the UV chamber were derived in terms of doses integrated over different wavelength ranges. The acceleration factor was found to depend strongly on the wavelength range of the dose considered, presenting an extra challenge to the assessment of the artificial material exposure duration.

  • Characterizing a UV chamber with Mercury Lamps for assessment of comparability to natural UV conditions
    Polymer Testing, 2009
    Co-Authors: Annika Heikkilä, M. Kaunismaa, T. Ture, Petri Kärhä, Jussi Kaurola, Antti Tanskanen, Timo Koskela, Simo Syrjala
    Abstract:

    UV radiation conditions in a UV chamber equipped with four 300-W Mercury vapour Lamps have been characterized to assess the exposure received by the specimens aged in the chamber. Spectrally resolved measurements were performed on UV radiation emitted by new Lamps and Lamps operated for 4850 h in the chamber. An intensity decrease of as much as 75% with a strong wavelength dependency was detected. By linking the measurements with independent broadband measurements of the UV radiation field emitted by a single lamp, the UV dose rate distribution on the specimen plane of the chamber was derived. A method for true exposure accumulation estimation, accounting for the fading of the Lamps, was developed. Accumulated UV radiation exposures on material samples in the chamber were derived and compared to long-term (1995-2007) average UV exposures received in natural sunshine at Jokioinen, Finland (lat. 60.4°N, long. 23.5°E, 104 m a.s.l.). Acceleration factors for the exposure in the UV chamber were derived in terms of doses integrated over different wavelength ranges. The acceleration factor was found to depend strongly on the wavelength range of the dose considered, presenting an extra challenge to the assessment of the artificial material exposure duration. © 2008 Elsevier Ltd. All rights reserved.

Jussi Kaurola - One of the best experts on this subject based on the ideXlab platform.

  • characterizing a uv chamber with Mercury Lamps for assessment of comparability to natural uv conditions
    Polymer Testing, 2009
    Co-Authors: Anu Heikkila, M. Kaunismaa, T. Ture, Petri Kärhä, Jussi Kaurola, Antti Tanskanen, Tapani Koskela, Simo Syrjala
    Abstract:

    Abstract UV radiation conditions in a UV chamber equipped with four 300-W Mercury vapour Lamps have been characterized to assess the exposure received by the specimens aged in the chamber. Spectrally resolved measurements were performed on UV radiation emitted by new Lamps and Lamps operated for 4850 h in the chamber. An intensity decrease of as much as 75% with a strong wavelength dependency was detected. By linking the measurements with independent broadband measurements of the UV radiation field emitted by a single lamp, the UV dose rate distribution on the specimen plane of the chamber was derived. A method for true exposure accumulation estimation, accounting for the fading of the Lamps, was developed. Accumulated UV radiation exposures on material samples in the chamber were derived and compared to long-term (1995–2007) average UV exposures received in natural sunshine at Jokioinen, Finland (lat. 60.4°N, long. 23.5°E, 104 m a.s.l.). Acceleration factors for the exposure in the UV chamber were derived in terms of doses integrated over different wavelength ranges. The acceleration factor was found to depend strongly on the wavelength range of the dose considered, presenting an extra challenge to the assessment of the artificial material exposure duration.

  • Characterizing a UV chamber with Mercury Lamps for assessment of comparability to natural UV conditions
    Polymer Testing, 2009
    Co-Authors: Annika Heikkilä, M. Kaunismaa, T. Ture, Petri Kärhä, Jussi Kaurola, Antti Tanskanen, Timo Koskela, Simo Syrjala
    Abstract:

    UV radiation conditions in a UV chamber equipped with four 300-W Mercury vapour Lamps have been characterized to assess the exposure received by the specimens aged in the chamber. Spectrally resolved measurements were performed on UV radiation emitted by new Lamps and Lamps operated for 4850 h in the chamber. An intensity decrease of as much as 75% with a strong wavelength dependency was detected. By linking the measurements with independent broadband measurements of the UV radiation field emitted by a single lamp, the UV dose rate distribution on the specimen plane of the chamber was derived. A method for true exposure accumulation estimation, accounting for the fading of the Lamps, was developed. Accumulated UV radiation exposures on material samples in the chamber were derived and compared to long-term (1995-2007) average UV exposures received in natural sunshine at Jokioinen, Finland (lat. 60.4°N, long. 23.5°E, 104 m a.s.l.). Acceleration factors for the exposure in the UV chamber were derived in terms of doses integrated over different wavelength ranges. The acceleration factor was found to depend strongly on the wavelength range of the dose considered, presenting an extra challenge to the assessment of the artificial material exposure duration. © 2008 Elsevier Ltd. All rights reserved.